Padlock with code4/21/2024 Gougler Keyless Locks Company manufactured locks for which the combination was a set number of audible clicks to the left and right, allowing them to be unlocked in darkness or by the vision-impaired. The cams typically have an indentation or notch, and when the correct permutation is entered, the notches align, allowing the latch to fit into them and open the lock. Customarily, a lock of this type is opened by rotating the dial clockwise to the first numeral, counterclockwise to the second, and so on in an alternating fashion until the last numeral is reached. The rotary combination locks found on padlocks, lockers, or safes may use a single dial which interacts with several parallel discs or cams. The component parts of a Stoplock combination padlock. When the notches in the discs align with the teeth on the pin, the lock can be opened.Ī single-dial padlock by Master Lock. The lock is secured by a pin with several teeth on it which hook into the rotating discs. One of the simplest types of combination lock, often seen in low-security bicycle locks, briefcases, and suitcases, uses several rotating discs with notches cut into them. The first commercially viable single-dial combination lock was patented on 1 February 1910 by John Junkunc, owner of American Lock Company. However his patent claim states "I do not claim as my invention a tumbler composed of two disks, one working within the other, such not being my invention.", but there is no reference to prior art of this type of lock. Joseph Loch was said to have invented the modern combination lock for Tiffany's Jewelers in New York City, and from the 1870s to the early 1900s made many more improvements in the designs and functions of such locks. Treat in 1869 describe themselves as improvements, suggesting that such mechanisms were already in use. US Patents regarding combination padlocks by J.B. Gerolamo Cardano later described a combination lock in the 16th century. 1200) also made combination locks, two of which are kept in Copenhagen and Boston Museums. In 1206, the Muslim engineer Al-Jazari documented a combination lock in his book al-Ilm Wal-Amal al-Nafi Fi Sina'at al-Hiyal ( The Book of Knowledge of Ingenious Mechanical Devices). Attached to a small box, it featured several dials instead of keyholes. The earliest known combination lock was excavated in a Roman period tomb on the Kerameikos, Athens. When the toothed pin is inserted and the discs are rotated to an incorrect combination, the inner faces of the discs block the pin from being extracted. The other side of the lock, or the other end of the cable, has a pin with several protruding teeth. The discs are mounted on one side of the lock, which may in turn be attached to the end of a chain or cable. The notches on the disc correspond to the numerals in the correct combination. Unlike ordinary padlocks, combination locks do not use keys.Įxploded view of the rotating discs. Types range from inexpensive three-digit luggage locks to high-security safes. The sequence may be entered using a single rotating dial which interacts with several discs or cams, by using a set of several rotating discs with inscribed symbols which directly interact with the locking mechanism, or through an electronic or mechanical keypad. ( Learn how and when to remove this template message)Ī combination lock is a type of locking device in which a sequence of symbols, usually numbers, is used to open the lock. JSTOR ( June 2009) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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